Could be that Mint users are generally less technical (I say this as a Mint user -- it is advertised as the user / noob friendly option) and thus less likely to report issues to the proper authorities.
I don't think so. Ubuntu paved the way for non-technical users, and unfortunately this is evident in the quality of a large number of bug reports that we receive.
Trying to stay objective, it's certainly not in dispute that Ubuntu is also "advertised as the user / noob friendly option" and continues to take this stance.
From this perspective, the difference between Debian user feedback and Ubuntu user feedback is night and day (I'm also a Debian developer). I don't think the difference between Ubuntu and Mint is anything nearly like that.
